Litter box



FIG. 1 is a top perspective view of a litter box showing our new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a right-side elevational view thereof;

FIG. 7 is a left-side elevational view thereof; and,

FIG. 8 is a rear elevational view thereof.

The broken lines illustrate portions of the litter box and form no part of the claimed design. 

CLAIM The ornamental design for a litter box, as shown and described. 